Plug Fouling = More Compression

C

Cajun Blues

Cadet
Joined
Jul 6, 2010
Messages
13
1994 Johnson 150. 5 Cylinders 90 PSI. One Cylinder 105 PSI and the plug is extremely fouled! Oil is not delivered to each cylinder separately so why one cylinder? Changed plugs ( as I did at the start of the season ) and she runs much better! I don't want it to happen again. Could Startron Fuel additive cause it?


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Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,930
Re: Plug Fouling = More Compression

Could be a temp problem as engine running to cold....
 
R

robert graham

Admiral
Joined
Apr 16, 2009
Messages
6,908
Re: Plug Fouling = More Compression

How long did it take for that plug to get so fouled?...Do you pull and inspect/clean/replace plugs on a yearly basis?
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: Plug Fouling = More Compression

Beware, OMC had some probs with those blocks back in those years with water getting into # 1 cyl due to a defective block. It usually took about 250-300 hrs for it to show up. Put a new plug in it and run it and see how long it takes to foul again. Keep us posted.
 
D

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: Plug Fouling = More Compression

Water in #1 cylinder on a 60* motor, not unheard of for sure......not necessairly related to running hours but will show up sometimes after an overheat. Commonly refered to as a "glue seam leak" and has to do with how the foam was glued together in the lost foam casting process.
 
1946Zephyr

1946Zephyr

Vice Admiral
Joined
Oct 21, 2008
Messages
5,556
Re: Plug Fouling = More Compression

Holy smokes. That is some serious fouling. :eek:
 
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